I'm just using the Ebay Thailand fella as an example. I have purchased 3 Taurus wood grips and one 686 grip from him.
EAA Windicator also uses the peg/post. That Taurus uses it on the Judge frame hasn't helped it's options either.
Point is, the traditional wood target grips (round, flat bottom) is only sold in the GP100 by Eagle Grips for 150 or 250 depending on flat vs textured cuts.
Even Ruger's Lett grips (rubber with wood insert) still only has one source that duplicates it, Altamont, and none when Lett grips were dropped or Lett went out of business (mystery still?).
The peg might open options in theory but in the real world the GP100 has far fewer grip options. The GP100 peg options are the current Lett grip which still has a hump, horrible hump (like the factory Hogue gorilla grip), or the fast angle away from the gun stub that looks like a crude pirate grip.
Meh. A buyer can buy more grip options in the S&W line. No one ever says the S&W square or round grips creates the option for more grips.
The 686/586 is an L frame and the GP100 shares the grip of the Super Red Hawk. At both over 30 years old, we can't say the peg has done anything but made fewer options for the GP100 that are dwarfed by the options of the L frame S&W.